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PMMA Property

May. 06, 2020
No.Propertyunitvalue
1Specific gravityg/cm³1.19
2Water absorption (24HRS)%0.30
3Sight transmittance (fullrays)%93
4Refractive index-1.49
5Shear strengthMPa64
6Tensile strengthMPa75
7Tensile strain at break%4.5
8Flexural strengthMPa120
9Charpy unnotched impact strehgthKJ/㎡17
10Rockwell hardness(M)-100
11Temperature of deflection under load95
12Vicat softening temperature105
13Thermal forming temperature140-180
14Coefficient of linear thermal expansioncm/cm/℃6*10-5
15Dielectrlc strengthKv/mm20


Comparison of physical properties of PMMA with other materials

MaterialElastic strength(kg/c㎡)Temperature of deflection(℃)Sight transmittance (%)Hardness (M)
PMMA900-133074-10393-9585-105
PS560-98065-1048965-80
AS980-133088-1048780-90
PC95130-1418775-85
PVC700-112066-7784


 Thickness Tolerance  

Sheet thicknessObjective ToleranceBest quality ProductsA GradeQualifed Products
(mm)(mm)Allowed Tolerance (mm)Allowed Tolerance (mm)Allowed Tolerance (mm)
1.8-2.5+/-0.2+/-0.2+/-0.2+/-0.3
3.0-4.0+/-0.2+/-0.2+/-0.3+/-0.4
5.0-6.0+/-0.3+/-0.3+/-0.4+/-0.6
8.0-9.0+/-0.3+/-0.4+/-0.6+/-0.8
10-12+/-0.5+/-0.6+/-0.8+/-0.9
15+/-0.7+/-0.8+/-1.0+/-1.2
18-20+/-0.8+/-1.5+/-1.8+/-2.0
25+/-1.5+/-2.0+/-2.2+/-2.5
30+/-2.0+/-2.7+/-3.0+/-3.2
40+/-2.3+/-3.0+/-4.0+/-4.5
50+/-2.5+/-4.0+/-5.0+/-5.5
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